visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2016-11-16 16:00 
연사  
장소 #1323(E6-2. 1st fl.) 

Realizing Haldane Model in Fe-based Honeycomb Ferromagnetic Insulators 

 

Nov. 16 (Wed), 4p.m., #1323(E6-2. 1st fl.)

Dr. Heung-Sik Kim , University of Toronto  

 

The topological Haldane model (THM) on a honeycomb lattice is a prototype of systems hosting topological phases of matter without external fields. It is the simplest model exhibiting the quantum Hall effect without Landau levels, which motivated theoretical and experimental explorations of topological insulators and superconductors. Despite its simplicity, its realization in condensed matter systems has been elusive due to a seemingly difficult condition of spinless fermions with sublattice-dependent magnetic flux terms. While there have been theoretical proposals including elaborate atomic-scale engineering, identifying candidate THM materials has not been successful, and the first experimental realization was recently made in ultracold atoms. Here we suggest that a series of Fe-based honeycomb ferromagnetic insulators, AFe2(PO4)2 (A=Ba,Cs,K,La) possess Chern bands described by the THM. While BaFe2(PO4)2 fails to exhibit quantized Hall effect due to the filling of even and odd Chern bands, we predict that compounds with A=K,Cs,La have nontrivial bulk Chern numbers with well-defined gap, thereby enabling a solid state realization of THM. 

 

Contact: MyungJoon Han, Physics Dept., (mj.han@kaist.ac.kr)

 

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
334 2021-07-29 14:00    Gravitationally Induced Dark Sector and Inflationary Dynamics file
333 2021-06-22 17:00    Spintronics meets Quantum Materials file
332 2021-06-11 16:00    Pseudogap in surface-doped black phosphorus file
331 2021-06-11 14:30    Engineering sound waves and vibrations in multi-mode nanomechanical systems file
330 2021-06-08 10:00    Photonic crystal devices for sensing file
329 2021-05-27 16:00    찾아가는 물리연구 현장(유럽 입자물리학연구소 소개) file
328 2021-05-17 17:00    Spin current generation and detection in uniaxial antiferromagnets file
327 2021-05-14 16:00    Spatial and temporal separation of environmental dephasing sources from solid-state quantum emitters file
326 2021-05-14 14:30    Electrically tunable spin valve effect in vertical van-der-Waals magnetic tunnel junctions file
325 2021-04-19 19:00    Evidence of Electrical Switching in Antiferromagnets and Coherent Spin Pumping file
324 2021-04-09 10:00    Integrated Lithium Niobate Photonics file
323 2021-04-02 16:00    Van der Waals heterostructures for orbital gating-based phototransistors and electronic spectroscopy
322 2021-04-02 14:30    Quantum computing and entanglement generation using trapped ions and photons
321 2021-03-25 16:00    Search for dark matter axion with Rydberg atoms file
320 2021-03-02 16:00    Sensitive terahertz detection with graphene-based transistors file
319 2021-02-17 09:00    석학 대중 강연 및 강의 시리즈 file
318 2021-02-15 17:00    Magnetic Cluster Octupole Domain evolutation in chiral antiferromagnets file
317 2021-02-02 14:30    Quantum- & Nano-Photonics 세미나(Integrated Nanophotonics with Metamaterials, Microcomb, and Atomic Systems) file
316 2021-01-28 18:00    Quantum metamaterials: concept, theory, prototypes and possible applications file
315 2021-01-28 15:00    Topological Transport of Deconfined Hedgehogs in Magnets file